[Repair help] Wharfedale Glendale 3XP speaker - No bass, bit fuzzy. Was dropped

I've "inherited" [See: Made use of] my Dads old Wharfedales. Beautiful speakers, need a bit of work to bring back to life and beauty when I can find the time. Got a great sound coming from one of them.

I have a problem with one though. My Dad said that in their youth, one of the speakers was knocked/dropped/encouraged to shake hands with gravity and swiftly thereafter, the floor. There's a dent in a corner as evidence of this.

Since this day the speaker hasn't worked as it should. Inside there's a circuit board of sorts which I need to check out, but any ideas guys? I've tried to be detailed. I can provide pics if asked.

tl;dr Speeker broken FIX IT PLZ